定义正弦波凋制信号与载波信号的幅值之比为调制比(amplitude modulation radio)M= ／ ，载波信号与调制波信号的频率之比为载波比(frequency modulation radio)R=fT／／1。通过调制，获得SPWM波形。
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The first radio broadcasts were made using amplitude modulation.
最初的无线电广播设备采用的是波幅调制。
From this point, M-ary Quadrature Amplitude modulation (MQAM), MultiCarrier modulation (MCM) and adaptive modulation techniques are good candidates in next generation mobile radio system.
从这一点出发，多元正交幅度调制(MQAM)、多载波调制(MCM)及自适应调制技术成为下一代移动无线系统中最有竞争力的几种候选技术。
The ultra wideband (UWB) radio models have been introduced with pulse-position-modulation (PPM), on-off-keying (OOK) and pulse-amplitude-modulation (PAM).
分析了超宽带冲激无线电的脉位调制、通断键控调制和脉冲幅度调制的信号模型。
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